Circuit and method for searching track on CD

Details Circuit and method for searching track on CD Circuit and method for searching track on CD

1989-03-17

1992-08-18

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 43, 369 4428, 369 4425, 369 54, 360 7804, G11B 700, G11B 2108

Patent

active

051405709

ABSTRACT:
A track search circuit includes a command decoder which decodes command data sent by a microcomputer and stored in a command register and outputs signals commanding a track jump and commanding count of a counter which counts a tracking error signal. Time difference between a present A-time and a target A-time is calculated such that an optical pick-up can be moved toward a target position by utilizing the track jump of 4.sup.n. When a counted value of the counter reaches a predetermined value, the A-time is renewed such that the time difference can be reduced by addition or subtraction suitable time data to or from the A-time. If the renewed A-time becomes within 1 minute with respect to the target A-time in repeating such a track jump in accordance with the renewed A-time, the optical pick-up is stopped to move, and the A-time is read to jump the optical pick-up again to catch the target position.

REFERENCES:
patent: 4694441 (1987-09-01), Tomisawa et al.
patent: 4899325 (1990-02-01), Katsuhara et al.

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